Posted by **Anonymous** on Saturday, September 28, 2013 at 3:16pm.

Set M consists of the consecutive integers from -15 to y, inclusive. If the sum of all the integers in set M is 70, How many numbers are in the set?

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**Anonymous**, Saturday, September 28, 2013 at 3:16pm
a. 33

b. 34

c. 35

d. 36

e. 37

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**bobpursley**, Saturday, September 28, 2013 at 6:07pm
-15 to +15 includes 31 integers, counting zero. The sum is zero.

so 16+17+18+19=70 (ie, 17.5 x 4).

so I count 31+5 integers.

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